The little dog video is ABSOLUTELY AWESOME.
I felt my head was going to explode for I couldn´t put my laughter into control and almost fell from my chair.
Lancaster:
I noticed the same thing you did, however, i do not think it was not any recoil force pushing our little friend to the side.
I think it was rather he noticed the rocket leaving the tube -very close to his face- and somehow wanted to "avoid it". Something that made the whole thing even funnier.
Laughing is a very healthy thing.
Thanks for posting that great shot.